On-Page SEO, Keyword Content on Big Commerce Website

I am looking for someone to assist me with On-Page SEO for my business, I have spent a lot of time and money with SEO companies (3 years) and have had very little results. What I have found is that the companies I have been using spent more time with off-page SEO and very little on page (if any)

It has taken me a very long time to build a presence on Google natural searches but I have noticed that good clean content on your website pages with keywords, back links etc really help.

I am looking for someone to put content on my website for each page and category.

I sell sewing machines, parts and accessories. My website is www.infinitysewing.co.uk

My main competitor its www.konsew.com I want to create content like this all over my website. He is at the top of google for most sewing machine keywords. Please check and you will see!

You can use my competitors site for inspiration and knowledge of the products but if you could also use google to add even more information that would be great and obviously I can help.

I also need help with all the errors on my google search console which are not indexing.

It would be good to have a zoom call with someone to explain things more in detail.

Thank you :)